How to Detect Type of My DC Motor?

You can match motor by f/V ratio (kRPM/V) and DCR or locked rotor current (stall current) The ratio of Stall torque to rated torque also gives the ESR and also the start to rated current ratio.No need for Zener transient protection to motor with caps but the series bridge PIV must withstand the spike. Generally line filters attenuate this very well.

1. Where can I find a high torque dc motor, about 6 inches long?

Grainger in most big cities, or junk yard heater motor

2. Where can I get an RS775 DC motor in Hyderabad?

In ebay it is available for online purchasingRS 775 High Torque DC 12V Multipurpose Brushed Motor, Bigger motor | eBayWhere can I get an RS775 DC motor in Hyderabad?

3. stall dc motor 12 volt for long time

When the motor is stalled, the current is the applied voltage divided by the resistance of the armature winding. If the stall current is 23 amps with 12 volts applied, the resistance is 12/23 = 0.52 ohms. If you put 1 ohm in series, the stall current will be 12/1. 52 = 7. 9 amps. If you want the stall current to be equal to the 0.14 amps rated current of the motor, the armature plus series resistance must be 12/0.14 = 85.7 ohms.If you do not want to buy or build a variable-voltage power supply, you can use resistors to have any stall current you want using the calculations described. Remember the power dissipated in the resistor will be the current squared multiplied by the resistance. The same is true of the power dissipated in the resistance of the armature winding

4. how to make a speed controller for a dc motor?

Use an electronic speed controller

5. VARIAC as DC motor speed controller from DC power source

Professors are very, very clever people*. If they say it is not possible I would drop it. In fact I also believe it is not possible. Variacs are transformers and transformers are relying on inductance. That is : they need a continuous changing current. With DC you only get the resistance of the copper wire which is very low. Maybe your Chinese friend is using the Variac as a giant potentiometer. You do not want that as it will heat up!*Which also occasionally make errors

6. What gauge wire is used for a 12V DC motor?

What gauge wire is used for a 12V DC motor?Depends on the motor current, the permitted voltage drop and the cable length. Do the maths

7. DC Motor giving poor output waveform - how do I fix?

When it is not connected to a motor the output voltage is ok,but when it is connecting to a motor the voltage drop means,the motor is not getting required current. So change mosfets to higher current ratings.

8. What If I mechnically rotate a 5000rpm dc motor at more than 5000rpm?

As others have noted, the question is how much faster? At some point you are inviting spontaneous disassembly of the commutator, bearing failure, or rotor-to-stator impact

9. How can i calculate the inertia of a DC motor with a voltage step reponse and the speed graph?

Motor Inertia Calculation

10. Can I make a dc motor run faster by giving it more oxygen?

No, a dc motor is not influenced by the air around it. To make it run faster, increase the voltage to it. But be careful, too many volts will burn the motor up.

11. How many minutes can Dc motor stand in continues running?

DC motors are usually pretty reliable. Unless it's a very cheap motor it should run for about 10,000 hours or more unless it's in a corrosive location. The biggest problem is the inexpensive motors have bushings rather than bearings. The bushings wear out faster

12. Is it possible to drive a 12V DC motor with XL6009?

5V boosted to 12V means 12V/5V= 2.4 times the current. IE: If you are drawing 1A at the 12V output, you need 2.4A at the 5V input. And that's at 100% efficiency, which we all know is not possible. That boost module states an efficiency of about 94%, but I would still expect less.That boost module link states a 4A input max and that the inductor can handle 3A max. I can say from experiance with those very boost modules that 3A continuous will burn them out at room temperature without heatsinks and fans. I would say 2A is a good limit.You did not give any details about the motor other than it is "12V"... Your motor will have current spikes upon starting, which you may be able to get away with, as it wo not be continuous. However, the motor appears to be rated at 1.2A max. You need 2.4*1.2A= 2.88A on the 5V input. That's awfully close to the hard-limit of 3A. If we also consider the current spikes upon starting or 'power-breaking' (quickly reversing direction), the current will be higher still.I would not feel comfortable with that boost converter for extended use. It would be less an issue if the motor were used at only partial capacity. If it is used lightly then you may be fine.Regardless, I would recommend connecting a PTC (auto resetting fuse) inline with the input of the boost converter. They do not cost much. PTF fuses can take a while to blow at 100-150% (seconds to minutes), so pick a rating of about 2A. That way, there is some form of protection against a stalled/"stuck" motor. They are thermal based, and will heat up (a lot) once they trip. In order for them to "reset", the current must be dropped.

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Shunt DC Motor Controller Improvement
Shunt DC motor controller improvementSo this looks as if the circuit controls armature current?It controls armature voltage.would it be better if the winding current was controlled?Controlling armature current with an outer voltage or speed control loop would be better, but more complex.By "winding current" I suspect you mean field winding current as apposed to armature winding current. Controlling the field winding current would make the minimum operating speed about equivalent to the present maximum speed. Reducing the field current will increase the speed and reduce the torque capability. I doubt very much that is what you want.The above seem to be the only actual questions asked. The question seems to imply that you wish to improve the control scheme because the motor " runs slightly erratically." You have not actually described what aspect of motor performance is undesirable.Speed decrease with increased load is normal for a simple armature voltage control. Random speed variation with a steady load could be due to line voltage variation, other power quality issues, motor brush problems or a loose connection. Failure to start relably would like be a brush problem— — — — — —Can you use an AC switch with a DC motor?Just follow the ratings of the switch. Typically, the DC voltage rating is less than the AC voltage rating. Current ratings are normally the same— — — — — —What is an interpole in a DC motor?Thanks for A2A.Purpose of Interpole in DC MachineFor understanding the role of Interpoles, we need to understand the effect of armature reaction in the DC Machine. The effect of armature mmf on the main field flux is to distort the main field flux and to reduce the net main field flux. The figure below, shows the effect of armature mmf on the main field flux. It is quite clear from the above figure that the flux at the location of Carbon Brush i.e. A, B and A are not zero and therefore an EMF will be induced in the coils undergoing commutation and will lead to the sparking. As we know that for better commutation, the coils short circuited by the brushes should have zero EMF induced in them. As the zero crossing of field flux is shifted due to armature reaction, the coils undergoing the commutation will have a net EMF induced in them. This induced EMF in the short circuited coil will delay the reversal of current in the short circuited coils and will result into poor commutation and sparking at the carbon brushes.The question arises how to resolve this issue?If we see the figure above, we observe that there is a net shift of zero crossing of net flux in the air gap by an angle Ɵ in the direction of rotation for Generator and opposite to the direction of rotation for Motor. So the cheap and easy solution shall be to shift the Carbon Brush at Zero Crossing of the air gap flux.Thus carbon Brush need to be shifted by an angle Ɵ from Geometrical Neutral Axis (GNA) in the direction of rotation for Generator and opposite to the direction of rotation for Motor.But this method of shifting the Carbon brush has a big disadvantage. What is that?As the Armature Reaction depends on the current flowing through the armature winding which in turn depends on the load current. Therefore as the loading of the DC Machine varies the angle Ɵ will also vary and therefore we need to continuously shift the Carbon Brushes. So we need to find a smart way.Again, looking back to the figure, if it could be possible to make the resultant or net air gap flux zero at GNA, then there would not have been any detrimental effect of armature reaction on commutation. Also, the existing flux at the GNA (at point C) is due to North Pole so we could use a South Pole (opposite of the pole which produced the imbalance at C) at C so that the net flux at C becomes Zero. Similarly at C' we can use a North Pole to make net flux Zero there. Okay, this will work fine but how t change the magnitude field strength of this newly installed poles at C and C'? Hmmmm. .We can use a winding on the newly installed poles at C and C' and connect that winding in series with armature winding so that the strength of field due to newly installed poles at C and C' varies proportionally will the loading of machine. Yes, this will work fine.So we can conclude our solution as,We will use Poles same as that of Main Poles ahead of GNA or Carbon Brush for Generator at the location of GNA or Carbon Brush and Poles same as Main Pole that of behind the GNA or carbon Brush for Motor at the location of GNA or Carbon Brush and will use winding on them and connect them in series with the armature winding as shown in figure below.The Poles used in our smart solution is called the Interpole. Interpoles are narrow poles placed at the GNA and fitted to the Yoke and also known as Commutating Poles or Compoles. For generator, the polarity of Interpoles must be same as that of main Pole ahead of it in the direction of rotation. For Motor, the polarity of Interpole must be same as that of Main Pole behind it. So I expect that you understand the purpose of Interpoles as you only designed it. But there is one more interesting role of Interpole.Interpole do not only nullify the effect of armature reaction but in addition, produces some extra mmf in the interpolar zone. This extra mmf in the interpolar zone induces rotational EMF in the short circuited coil undergoing commutation in such a direction to oppose the reactance voltage in the coil. Thus the resultant the resultant voltage in the short circuited coil becomes zero and the commutation is spark less.What is an interpole in a DC motor?
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